Hey, lay off the Sauce! LOL Nah, not when it comes to Buffalos in a slab. Those under graded coins don't come around very often. This one is definitely MS. Unless you see something?
LOL! I guessed 58 because the buffalo looks like the torso has gotten a bit of wear. Maybe it was just a worn die? To be honest, I'm crap at estimating grade on buffalo's. I'm just going on comparative pictures from coinfacts so take my guess with a grain of salt!
They are one of the hardest to grade, the way I was taught was to look at the horn. It took a while to be taught about the tail. When I look at a buffalo, I look at the tail. If it is still split then I know that the coin was struck fairly well.
MS66 It is hard to find any detail, on any buffalo, in the shoulder of the bison or the knot of the braid. I had to take a look at photos of proofs to make sure what I was supposed to see.